A microﬂuidic study of transient ﬂow states in permeable media using ﬂuorescent particle image velocimetry

Velocity ﬁelds in ﬂow in permeable media are of great importance to many subsurface processes such as geologic storage of CO2 , oil and gas extraction, and geothermal systems. Steady-state ﬂow is characterized by velocity ﬁelds that do not change signiﬁcantly over time. The ﬂow ﬁeld transitions to a...

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Autores principales:	Jindi Sun, Ziqiang Li, Frederico Furtado, Saman A. Aryana
Formato:	article
Lenguaje:	EN
Publicado:	Yandy Scientific Press 2021
Materias:	particle image velocimetry transition state permeable media microﬂuidics Physics QC1-999
Acceso en línea:	https://doaj.org/article/1554287028c044fa96dd0a8edef954b8
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spelling	oai:doaj.org-article:1554287028c044fa96dd0a8edef954b82021-11-08T03:04:55ZA microﬂuidic study of transient ﬂow states in permeable media using ﬂuorescent particle image velocimetry10.46690/capi.2021.04.032652-3310https://doaj.org/article/1554287028c044fa96dd0a8edef954b82021-12-01T00:00:00Zhttps://www.yandy-ager.com/index.php/cap/article/view/383https://doaj.org/toc/2652-3310Velocity ﬁelds in ﬂow in permeable media are of great importance to many subsurface processes such as geologic storage of CO2 , oil and gas extraction, and geothermal systems. Steady-state ﬂow is characterized by velocity ﬁelds that do not change signiﬁcantly over time. The ﬂow ﬁeld transitions to a new steady state once it experiences a disturbance such as a change in ﬂow rate or in pressure gradient. This transition is often assumed to be instantaneous, which justiﬁes the expression of constitutive relations as functions of instantaneous phase saturations. This work examines the evolution of velocity ﬁelds in a surrogate quasi-2D permeable medium using a microﬂuidic device, a microscopy system, and a high-speed camera. Tracer particles are injected into the medium along with Deionized water. The evolution of the velocity ﬁeld is examined by tracing these particles in the captured images using the standard high-density particle image velocimetry algorithm founded on cross-correlation. The results suggest that the transition between steady states for an incompressible ﬂuid takes a ﬁnite and non-negligible amount of time that is independent of the magnitude of the change in pressure gradient. The existence of transient states and the nature of the response during these states are readily interpreted by the principle of least action where ﬂow gradually establishes an optimal conﬁguration such that energy dissipation is minimized. The ﬁndings provide evidence against the applicability of the assumption that ﬂowing phases relax instantaneously to their steady states and, hence, against the accuracy of the classical multiphase extension of Darcy’s law.Jindi SunZiqiang LiFrederico FurtadoSaman A. AryanaYandy Scientific Pressarticleparticle image velocimetrytransition statepermeable mediamicroﬂuidicsPhysicsQC1-999ENCapillarity, Vol 4, Iss 4, Pp 76-86 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	particle image velocimetry transition state permeable media microﬂuidics Physics QC1-999
spellingShingle	particle image velocimetry transition state permeable media microﬂuidics Physics QC1-999 Jindi Sun Ziqiang Li Frederico Furtado Saman A. Aryana A microﬂuidic study of transient ﬂow states in permeable media using ﬂuorescent particle image velocimetry
description	Velocity ﬁelds in ﬂow in permeable media are of great importance to many subsurface processes such as geologic storage of CO2 , oil and gas extraction, and geothermal systems. Steady-state ﬂow is characterized by velocity ﬁelds that do not change signiﬁcantly over time. The ﬂow ﬁeld transitions to a new steady state once it experiences a disturbance such as a change in ﬂow rate or in pressure gradient. This transition is often assumed to be instantaneous, which justiﬁes the expression of constitutive relations as functions of instantaneous phase saturations. This work examines the evolution of velocity ﬁelds in a surrogate quasi-2D permeable medium using a microﬂuidic device, a microscopy system, and a high-speed camera. Tracer particles are injected into the medium along with Deionized water. The evolution of the velocity ﬁeld is examined by tracing these particles in the captured images using the standard high-density particle image velocimetry algorithm founded on cross-correlation. The results suggest that the transition between steady states for an incompressible ﬂuid takes a ﬁnite and non-negligible amount of time that is independent of the magnitude of the change in pressure gradient. The existence of transient states and the nature of the response during these states are readily interpreted by the principle of least action where ﬂow gradually establishes an optimal conﬁguration such that energy dissipation is minimized. The ﬁndings provide evidence against the applicability of the assumption that ﬂowing phases relax instantaneously to their steady states and, hence, against the accuracy of the classical multiphase extension of Darcy’s law.
format	article
author	Jindi Sun Ziqiang Li Frederico Furtado Saman A. Aryana
author_facet	Jindi Sun Ziqiang Li Frederico Furtado Saman A. Aryana
author_sort	Jindi Sun
title	A microﬂuidic study of transient ﬂow states in permeable media using ﬂuorescent particle image velocimetry
title_short	A microﬂuidic study of transient ﬂow states in permeable media using ﬂuorescent particle image velocimetry
title_full	A microﬂuidic study of transient ﬂow states in permeable media using ﬂuorescent particle image velocimetry
title_fullStr	A microﬂuidic study of transient ﬂow states in permeable media using ﬂuorescent particle image velocimetry
title_full_unstemmed	A microﬂuidic study of transient ﬂow states in permeable media using ﬂuorescent particle image velocimetry
title_sort	microﬂuidic study of transient ﬂow states in permeable media using ﬂuorescent particle image velocimetry
publisher	Yandy Scientific Press
publishDate	2021
url	https://doaj.org/article/1554287028c044fa96dd0a8edef954b8
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A microﬂuidic study of transient ﬂow states in permeable media using ﬂuorescent particle image velocimetry

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